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Comparison of Two Coronal Magnetic Field Models to Reconstruct a Sigmoidal Solar Active Region with Coronal Loops
Duan, Aiying; Jiang, Chaowei; Hu, Qiang; Zhang, Huai; Gary, G. Allen; Wu, S. T.; Cao, Jinbin; Duan, AY (reprint author), Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China.; Duan, AY (reprint author), Chinese Acad Sci, SIGMA Weather Grp, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.; Duan, AY (reprint author), Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA.
Department空间科学部
Source PublicationASTROPHYSICAL JOURNAL
2017
Volume842Issue:2Pages:119
ISSN0004-637X
Language英语
KeywordMagnetic Fields Magnetohydrodynamics (Mhd) Methods: Numerical Sun: Corona Sun: Flares
AbstractMagnetic field extrapolation is an important tool to study the three-dimensional (3D) solar coronal magnetic field, which is difficult to directly measure. Various analytic models and numerical codes exist, but their results often drastically differ. Thus, a critical comparison of the modeled magnetic field lines with the observed coronal loops is strongly required to establish the credibility of the model. Here we compare two different non-potential extrapolation codes, a nonlinear force-free field code (CESE-MHD-NLFFF) and a non-force-free field (NFFF) code, in modeling a solar active region (AR) that has a sigmoidal configuration just before a major flare erupted from the region. A 2D coronal-loop tracing and fitting method is employed to study the 3D misalignment angles between the extrapolated magnetic field lines and the EUV loops as imaged by SDO/AIA. It is found that the CESE-MHD-NLFFF code with preprocessed magnetogram performs the best, outputting a field that matches the coronal loops in the AR core imaged in AIA. 94 A with a misalignment angle of similar to 10 degrees. This suggests that the CESE-MHD-NLFFF code, even without using the information of the coronal loops in constraining the magnetic field, performs as good as some coronal-loop forward-fitting models. For the loops as imaged by AIA. 171 A in the outskirts of the AR, all the codes including the potential field give comparable results of the mean misalignment angle (similar to 30). Thus, further improvement of the codes is needed for a better reconstruction of the long loops enveloping the core region.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5998
Collection空间科学部
Corresponding AuthorDuan, AY (reprint author), Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China.; Duan, AY (reprint author), Chinese Acad Sci, SIGMA Weather Grp, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.; Duan, AY (reprint author), Univ Alabama, Ctr Space Plasma & Aeron Res, Huntsville, AL 35899 USA.
Recommended Citation
GB/T 7714
Duan, Aiying,Jiang, Chaowei,Hu, Qiang,et al. Comparison of Two Coronal Magnetic Field Models to Reconstruct a Sigmoidal Solar Active Region with Coronal Loops[J]. ASTROPHYSICAL JOURNAL,2017,842(2):119.
APA Duan, Aiying.,Jiang, Chaowei.,Hu, Qiang.,Zhang, Huai.,Gary, G. Allen.,...&Duan, AY .(2017).Comparison of Two Coronal Magnetic Field Models to Reconstruct a Sigmoidal Solar Active Region with Coronal Loops.ASTROPHYSICAL JOURNAL,842(2),119.
MLA Duan, Aiying,et al."Comparison of Two Coronal Magnetic Field Models to Reconstruct a Sigmoidal Solar Active Region with Coronal Loops".ASTROPHYSICAL JOURNAL 842.2(2017):119.
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